Plex server error: Unable to find client profile for device; platform=Kodi, platformVersion=18.7

Odroid N2
CoreELEC 9.2.3
Plex server on Synology 1.19.5.3112

No updates applied recently.
Started seeing this Plex media server error on July 29 every 2 seconds:
Jul 29, 2020 22:01:40.228 [0x7f5c43d11700] ERROR - Unable to find client profile for device; platform=Kodi, platformVersion=18.7 Git:xxx, device=Linux, model=Unknown

Is this a Kodi error or Plex Server error?

Thanks

This is a problem of PMS.
Take a look at this thread in the Plex forums - this problem exists since 2017 and wasn’t properly addressed until then:

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